Meteoritical Bulletin: Entry for LaPaz Icefield 04757

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LaPaz Icefield 04757

Basic information

Name: LaPaz Icefield 04757
This is an OFFICIAL meteorite name.
Abbreviation: LAP 04757
Observed fall: No
Year found: 2004
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 12.8 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 30(1)	(2007)	Chondrite-ung
Meteoritical Bulletin:	MB 92	(2007)	Acapulcoite
Antarctic Meteorite Newsletter:	AMN 44(1)	(2021)	H4-an
Recommended:			H4-an [explanation]

This is 1 of 24 approved meteorites classified as H4-an. [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 16 Feb 2007
Revised 13 Mar 2021: Reclassified in AMN 44(1)

Writeup

help

Writeup from AMN 30(1):

Sample No.:	LAP 04757; LAP 04773
Location:	LaPaz Ice Field
Field No.:	17603; 17035
Dimensions (cm):	2.5x2.0x1.0; 2.25x1.25x1.5
Weight (g):	12.8; 8.298
Meteorite Type:	Chondrite Ungrouped

Macroscopic Description: Kathleen McBride
Exteriors of these meteorites have dull brown/black fusion crust with oxidation haloes. The interiors reveal a rusty brown/black matrix with high metal content.

Thin Section (,2) Description: Tim McCoy and Valerie Reynolds
These meteorites are so similar that a single description suffices. The sections consist of abundant chondrules set in a metal- and sulfide-bearing, weathered matrix. Shock effects are present, including metal-sulfide melting at grain boundaries. Olivine is homogeneous at Fa₁₃ and pyroxene exhibits a small range at Fs_13-16. Links to the acapulcoites or low-FeO chondrites (Russell et al., 1998) should be considered, although LAP 04773/04757 are less metamorphosed than the former and more magnesian than is typical for the latter.

Thin Section Images

Cross-Polarized Light LAP 04757	Plane-Polarized Light LAP 04757	Reflected Light LAP 04757

Cross-Polarized Light LAP 04773	Plane-Polarized Light LAP 04773	Reflected Light LAP 04773
LAP 04773 - Cross-Polarized Light	LAP 04773 - Plane-Polarized Light	LAP 04773 - Reflected Light

Lab Images

LAP 04757

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Bibliography:

Russell S.S., McCoy T.J., Jarosewich E., and Ash R.D. (1998) The Burnwell, Kentucky, low iron oxide chondrite fall: Description, classification and origin. Meteorit. Planet. Sci. 33, 853-856. (link)

Data from:
  MB92
  Table 3
  Line 295:

Mass (g):	12.8
Class:	Acp
Weathering grade:	C
Fayalite (mol%):	13
Ferrosilite (mol%):	12-17

Plots:

O isotopes:

Catalogs:

Search for this meteorite in the NASA/JSC database (U.S.):

References:

Published in Antarctic Meteorite Newsletter 30(1) (2007), JSC, Houston
Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)

Find references in NASA ADS:
Find references in Google Scholar:

Photos:

Credit	Photos
Photographs from AMN:
JSC	A photo is in the write-up above

Geography:

Antarctica

Antarctica

Coordinates:

Unknown.

Statistics:
This is 1 of 45500 approved meteorites from Antarctica (plus 3472 unapproved names)

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